Synthetic resin stent

Abstract

Provided is a synthetic resin stent that has resistance to pressure externally applied from the radial direction while in an enlarged diameter state even when the synthetic resin fibers are thin. The synthetic resin stent comprises: a stent main section that is formed by synthetic resin fibers into a cylinder and that can deform from a reduced diameter state to an enlarged diameter state; and a restricting mechanism that keeps the stent main section in the enlarged diameter state by restricting the stent main section from reducing in diameter when in the enlarged diameter state. The synthetic resin stent preferably further comprises a diameter enlarging mechanism that is connected to the stent main section and that deforms the stent main section from a reduced diameter state to an enlarged diameter state.

The invention claimed is: 
     
       1. A synthetic resin stent comprising:
 a stent main section that is formed by synthetic resin fibers into a cylinder, and that can deform from a reduced diameter state to an enlarged diameter state, 
 a restricting mechanism that keeps the stent main section in the enlarged diameter state by restricting the stent main section from reducing when in the enlarged diameter state, and 
 a diameter enlarging mechanism that is connected to the stent main section and deforms the stent main section from the reduced diameter state to the enlarged diameter state, wherein 
 the stent main section is formed such that diameters of end portions of the stent main section are larger than a diameter of a center part of the stent main section, 
 the diameter enlarging mechanism comprises:
 an end part diameter enlarging mechanism that enlarges a diameter of an end portion side of the stent main section, and 
 a center part diameter enlarging mechanism that enlarges the diameter of the center part of the stent main section, and 
 
 the restricting mechanism comprises:
 an end restricting mechanism that keeps the end portions of the stent main section in the enlarged diameter state, and 
 a center part restricting mechanism that keeps the center part of the stent main section in the enlarged diameter state. 
 
 
     
     
       2. The synthetic resin stent according to  claim 1 , wherein the end part diameter enlarging mechanism and the center part diameter enlarging mechanism comprise a string-like member for connecting one end to one end side in an axial direction of the stent main section, and extending to an other end side in the axial direction of the stent main section, wherein
 the stent main section contracts in the axial direction and expands in diameter by pulling the string-like member toward the other end side. 
 
     
     
       3. The synthetic resin stent according to  claim 2 , wherein the end restricting mechanism and the center part restricting mechanism comprise a locking part forming in the string-like member, and an annular part annularly formed on the other end side of the stent main section and through which the string-like member is inserted, wherein
 the stent main section is kept in the enlarged diameter state by pulling the string-like member toward the other end side so that the locking part is locked in the annular part. 
 
     
     
       4. The synthetic resin stent according to  claim 3 , wherein the locking part comprises a knot part and a loop part formed by tying the string-like member, wherein
 the loop part is formed so as to swell from the knot part to one end side of the stent main section. 
 
     
     
       5. The synthetic resin stent according to  claim 4 , wherein the size of the loop part is configured to be larger than the size of the annular part. 
     
     
       6. The synthetic resin stent according to  claim 3 , wherein the string-like member comprises a first string-like member in which one end connects to the stent main section and the locking part is formed, and a second string-like member removably coupled to an other end side of the first string-like member. 
     
     
       7. The synthetic resin stent according to  claim 2 , wherein the string-like member is arranged on an inside of the stent main section. 
     
     
       8. The synthetic resin stent according to  claim 7 , wherein the string-like member is arranged along the stent main section between an end connected to the stent main section and the annular part. 
     
     
       9. The synthetic resin stent according to  claim 2 , wherein a plurality of the string-like members are arranged at equal intervals in a circumferential direction of the stent main section. 
     
     
       10. The synthetic resin stent according to  claim 1 , wherein a diameter of the synthetic resin fibers is 0.05 to 0.7 mm.